Modern Defense: Randspringer Variation

1.d4 g6 2.c4 Bg7 3.Nc3 d6 4.e4 f5

ECO A42

The Modern Defense: Randspringer Variation is a chess opening line in the Modern Defense complex, reached after 1.d4 g6 2.c4 Bg7 3.Nc3 d6 4.e4 f5.

It is catalogued under code A42 in the Encyclopaedia of Chess Openings (ECO).

The defining move f5 is chosen by Black on move 4.

Study this line with a grandmaster

This position is covered in the Modern Defense course: a GM-authored repertoire you study move by move, then practice against a human-like AI opponent.

Every chess term used here is defined in the chess terms glossary. Browse all opening courses or the full ECO code index.